The visible portion of an erect penis averages 5.56″ (14 cm) according to a survey of over 1,600 men as reported in the Journal of Sexual Health in 2013. When your friend says his penis is 7.5″ long, he’s probably lying, unless he’s including the portion of the penis inside his body. In that case, his 7.5″ penis is a little shorty. Half of the length of the penis is buried inside. The sphincters leading into the bladder are 12 to 14 inches (30 to 35 cm) away from the tip.
